EMERSON
Measurement Instrumentation
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Rosemount™ SeniorSonic 3414 Four-Path Gas Ultrasonic Flow Meter

Preferred for fiscal gas measurement, this 4-path meter delivers high accuracy and fast diagnostics with British Gas-chordal design and 3410 electronics.

The Rosemount™ SeniorSonic™ 3414 Four‑Path Gas Ultrasonic Flow Meter delivers high‑integrity custody transfer measurement with ±0.1% flow calibrated accuracy and advanced diagnostics that detect flow disturbances, liquids, and buildup early. Continuous Flow Analysis and Smart Meter Verification provide actionable insights to reduce uncertainty, protect revenue, and ensure reliable, audit‑ready performance in real‑world conditions.​

Key Features

  • Detect flow disturbances early with a 3D flow profile view that reveals swirl, asymmetry, crossflow and turbulence for faster troubleshooting.​
  • Maintain custody transfer accuracy using continuous diagnostics that identify liquids, buildup, and abnormal flow conditions before bias occurs.​
  • Increase operational flexibility with >100:1 rangeability to support wide flow conditions with fewer meter runs. ​
  • Automate compliance with integrated AGA 8 and AGA 10/GERG-2008 calculations for consistent, audit-ready gas measurement.​
  • Reduce measurement uncertainty with predictive alerts that flag blockage, contamination, and changing gas conditions.​
  • Minimize downtime with non-wetted transducers that can be replaced under pressure without special tools.​
  • Lower total cost of ownership with no moving parts and zero pressure drop to reduce maintenance and compression costs.​
  • Simplify troubleshooting with Smart Meter Verification that converts diagnostics into actionable insights and recommended actions.​
  • Enable flexible integration with high-speed electronics offering Ethernet connectivity and multiple I/O options.​

Frequently Asked Questions

The Rosemount™ SeniorSonic™ 3414 Four-Path Gas Ultrasonic Flow Meter maintains custody transfer accuracy in natural gas transmission pipelines by using a non-planar four-path chordal design that directly measures velocity across the pipe cross-section and provides a 3D view of the gas flow profile. This design achieves ±0.1% accuracy after flow calibration and ±0.05% repeatability while meeting the OIML R137-1 perturbation test requirements for both mild and severe flow disturbances.​

The Rosemount™ SeniorSonic™ 3414 requires 8–15 pipe diameters of straight run, depending on the flow conditioner used, to achieve custody transfer accuracy in accordance with standards such as AGA 9, ISO, and MID. Its four-path design can detect flow disturbances but cannot fully compensate for them without proper installation design.​

The Rosemount™ 3414 uses multi-path velocity measurements and diagnostic data, including transducer gain, signal-to-noise ratio (SNR), path performance, speed of sound (SOS), profile factor, symmetry, swirl, crossflow, and turbulence, to identify meter issues and abnormal flow conditions. The meter generates alarms for conditions such as transducer signal degradation, contamination, and blockage, which are among the leading causes of custody transfer measurement bias in natural gas pipelines, enabling early intervention before measurement deviations exceed regulatory tolerances.

The Rosemount™ 3414 is suited for custody transfer applications such as transmission pipelines, city gate stations, and metering skids. Its four-path design provides an optimal balance of accuracy, cost, and robustness without requiring the additional verification or redundancy often associated with higher-risk applications.

The Rosemount™ 3414 is designed for custody transfer, meets all applicable standards, and provides reliable detection of common flow disturbances using its four-path chordal geometry. More paths do not necessarily mean better accuracy, provided the minimum installation requirements are met. Additional paths are typically used to provide enhanced diagnostics or to reduce upstream installation requirements.​